package string;

/**
 * char charAt(int index)
 * 提取指定位置上的字符
 */
public class ChatAtDemo {
    public static void main(String[] args) {
        //            01234567890
        String str = "www.tedu.cn";
        char c = str.charAt(4);
        System.out.println(c);

        for (int i = 0; i < str.length(); i++) {
            c = str.charAt(i);
            System.out.println(c);
        }


        //检测回文
        String line = "上海自来水来自海上";

       /* char c1 = line.charAt(0);
        char c2 = line.charAt(line.length()-1);

        c1 = line.charAt(1);
        c2 = line.charAt(line.length()-2);

        c1 = line.charAt(2);
        c2 = line.charAt(line.length()-3);

        c1 = line.charAt(3);
        c2 = line.charAt(line.length()-4);*/

//        boolean check = true;
//        for(int i=0;i<line.length()/2;i++) {
//            char c1 = line.charAt(i);
//            char c2 = line.charAt(line.length()-1 - i);
//            if(c1!=c2){
//                System.out.println("不是回文");
//                check = false;
//                break;
//            }
//        }
//        if(check) {
//            System.out.println("是回文");
//        }


//        for(int i=0;i<line.length()/2;i++) {
//            char c1 = line.charAt(i);
//            char c2 = line.charAt(line.length()-1 - i);
//            if(c1!=c2){
//                System.out.println("不是回文");
//                return;
//            }
//        }
//        System.out.println("是回文");


        for(int i=0;i<line.length()/2;i++) {
            char c1 = line.charAt(i);
            char c2 = line.charAt(line.length()-1 - i);
            if(c1!=c2){
                System.out.print("不");
                break;
            }
        }
        System.out.println("是回文");
    }
}
























